Navitech Car Windscreen Suction Mount Ball for Garmin Nuvi 465t, Nuvi 500, Nuvi 5000, Nuvi 550, Nuvi 750, Nuvi 755t, Nuvi 760, Nuvi 765t, Nuvi 770, Nuvi 775t, Nuvi 780, Nuvi 785t Full Clip and Lock System to windscreen full ultimate hold (up to 7kg in weight) 361 degree strudy operational head to your Garmin (Does not include Mounting head, please transfer from your existing Garmin) The ball joint is 17mm in diameter Fully under a 12 month warranty